W3School TIY Editor
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<!DOCTYPE html> <html> <body> <form> <fieldset id="myFieldset" name="personalinfo"> Name: <input type="text" name="username"><br> Email: <input type="text" name="usermail"><br> </fieldset> </form> <p>单击该按钮可显示字段集的新名称。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("myFieldset").name = "newName"; document.getElementById("demo").innerHTML = document.getElementById("myFieldset").name; } </script> </body> </html>